75.2 million: Number of students enrolled in U.S. schools from nursery to college, 2006.

56: Percentage of three and four-year-olds enrolled in school, 2006.

17,000: Number of students 30 years and older enrolled in elementary school, 2006.

11: Projected percentage of students in grades 1-12 enrolled in private school fall 2008.

Source: U.S. Census